X28HC256 256k, 32k X 8-Bit; 5V, Byte Alterable EEPROM

Category: Electronics, Intersil Corporation, Memory ICS

Overview

The X28HC256 is a high-performance 256 kilobit, organized as 32k x 8 EEPROM, designed and manufactured using Intersil’s specialized CMOS technology that features textured poly floating gates. With an emphasis on reliability and ease of use, the X28HC256 operates on a single 5V power supply while offering high-speed nonvolatile memory storage.

Key Features

With an access time of 90ns, the X28HC256 provides efficient read and write capabilities. It is engineered for simple operation incorporating byte and page write sequences without necessitating a prior erase cycle. It eliminates the need for external programming voltages commonly required in other memory devices, supporting a 128-byte page write operation which boasts a quick 24µs/byte write cycle. The device can be rewritten typically in less than 0.8 seconds, making it suitable for applications where fast and frequent updates to memory are necessary.

Power Efficiency and Data Protection

In terms of power consumption, the device is designed to be economical, consuming 60mA in its active mode and only 500µA when in standby. To prevent accidental data alterations, the X28HC256 incorporates a software data protection mechanism. This built-in feature enhances system-level data integrity by guarding against unintended writes during power transitions.

Performance and Reliability

The X28HC256 excels in providing a robust storage solution with a minimum of 100,000 write cycles per byte and a data shelf life that extends to 100 years. Its reliability is increased by the inclusion of features such as early end of write detection, made possible by DATA polling and Toggle bit polling, which serve as methods for early detection of the completion of write operations.

Standards and Environment Compliance

Renowned for compatibility, the device adheres to JEDEC standard data protection requirements and is also RoHS compliant, meeting current regulations for environmental sustainability.

Functional Architecture

The datasheet provides a block diagram illustrating the internal structure which includes EEPROM array, buffers, latches, decoders, and a control logic and timing section to facilitate write and read operations. The arrangement of Address Inputs (AO to A14), Data Inputs/Outputs (IO0 to IO7), and Control Inputs (notably CE – Chip Enable; OE – Output Enable; WE – Write Enable) reflects a purposeful design conducive to easy interfacing with a variety of microprocessors and microcontroller systems.

Packaging Information

This introductory section on the datasheet also usually includes the packaging information, which provides details about the physical dimensions and pin configuration of the X28HC256, aiding system designers with board-level integration.